Physics, 19.01.2020 12:31, falconsfan20182
Mosses don't spread by dispersing seeds; they disperse tiny spores. the spores are so small that they will stay aloft and move with the wind, but getting them to be windborne requires the moss to shoot the spores upward. some species do this by using a spore-containing capsule that dries out and shrinks. the pressure of the air trapped inside the capsule increases. at a certain point, the capsule pops, and a stream of spores is ejected upward at 3.6 m/s, reaching an ultimate height of 20 cm. a)what fraction of the initial kinetic energy is converted to the final potential energy? express your answer numerically. ufki =b)what happens to the "lost" energy? choose the correct answerit has been transformed into thermal energy of the spores and surrounding air. it has been transformed into thermal energy of the spores and potential energy of surrounding air. it has been transformed into potential energy of the spores and kinetic energy of surrounding air. it has been transformed into potential energy of the spores and surrounding air.
Answers: 2
Physics, 22.06.2019 01:30, chloe1107
Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.
Answers: 1
Physics, 22.06.2019 11:20, cjd1214812148
The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)
Answers: 3
Mosses don't spread by dispersing seeds; they disperse tiny spores. the spores are so small that th...
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